question_answer

  From a cliff of 49 m high, a man drops a stone. One second later, he throws another stone. They both hit the ground at the same time. Find out the speed with which he threw the second stone.

Answer:

                                    For the first stone  and As we know                                 (1) i.e., first stone would take 3.16 s to reach the ground.                                                            (1) For the second stone, the time taken by second stone to reach the ground is one second less than that taken by the first stone as both the stones reach the ground at the same time. i.e., for the second stone, For the second stone, and As or                                       (1) i.e., the second stone was thrown downward with a speed of 12.1